Your replies always help. This is related to the other question on the WAN forum.

This option would perhaps allow me to simply route to the new ISP off of the customers Core switch by installing a 2nd ASA between the new ISP connection and the inside networks. This would eliminate the need for me to have to let the existing ASA make routing decisions as to which ISP to send to.

Seems there may still be some confusion though as all the companies existing DNS records are configured on the old legacy network. I am not sure how I could get the switch to make decisions as to which ASA to send to. Sometimes the traffic will have to go to the old ISP for Mail to work.